冷冻干燥法制备MgO－ZrO_2超细粉末

PREPARATION OF MgO-ZrO_2 ULTRAFINE POWDER BY FREEZE-DRYING

采用冷冻干燥法制得了烧结性能良好的ｃ－ＺｒＯ_２（１０％ＭｇＯ，以摩尔计）超细粉末，并对冷冻干燥工艺进行了探索。粉末的煅烧温度为８００℃，成型后试样经１６００℃，２ｈ烧成，相对体积密度达到了９５％以上，且全部为立方相。

A kind of c-ZrO_2(10%MgO,in mole)ultrafine powder with a high sinterability was prepared by freeze-drying,The hydrous zirconia gel prepared by precipitation was dispersed in Mg (NO_3)_2 solution and then freeze-dried.The c-ZrO_2(10%MgO) ultrafine powder is obtained by calcining the dried gel at 800℃for 1h.Fired at l600℃ for 2h,the relative bulk density of the samples made from the powder is up to 95%and the phase of the samples is all of cubic phase.